Exam Maths Puzzle Time Distance and Speed

A certain plane can fly at 400km/h when there is no wind.. On a certain windy day, this plane can travel 210km with a tailwind in the same time that it can travel 19

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Exam Other Question

a train traveled form its terminal to an ocean resort at 90/km/h and then returned at 72km/h. What is the rail distance between the train terminal and the ocean resort if the round trip travel time was 9 hours? x^2-3x-3=0